Dissertation > Excellent graduate degree dissertation topics show

An Investigation into the Calcination of Cement Clinker by Coarse Particles Fluidization-Thermo Dynamics of the Calcination Process

Author: DuanRan
Tutor: XuDeLong;FanHaiHong
School: Xi'an University of Architecture and Technology
Course: Materials Science
Keywords: coarse particle fluidized bed coal-contained cement raw real pellet clinker calcinations
CLC: TQ172.6
Type: Master's thesis
Year: 2008
Downloads: 87
Quote: 0
Read: Download Dissertation

Abstract


Cement is used in civil engineering in largely quantity,existing cement production technologies consume energy resource excessively in some degree.The energy shortage becomes more and more severe all over the world,so it is necessary to develop new types of cement production technology with low energy consumption and high thermal efficiency.The Coarse-Particle-Fluidized-bed technology,which turns clinker calcinations from stack- to suspending-state,suggested by the Institute of Powder Engineering of Xi’an University of Architecture and Technology.The technology has been explored for many years,and various schemes and facilities have been tested.In the period from June 2007 to May 2008,a new type of fluidization bed of laboratory was designed and built.On the basis of experiments carried out in the previous projects,the author studied the behavior of the meal pellets under high temperature condition,including heating, limestone decomposition,and burning of the coal contents in the meal pellet.In addition, mechanisms of fragmentation of pellets and agglomeration between pellets under high temperature were analyzed,and the measures to circumvent these difficulties were suggested as well.Then the experiment for clinker calcinations under high temperature was carried out by using a high-temperature-fluidized-device of pilot scale.The experimental results indicated that time required for the complete decomposition and combustion of the meal pellet decreased with increasing in gas temperature and velocity and decreasing in pellet size as well.It was found that to prevent pellets from fragmentation in an unaccepted level,the temperature in preheating zone should be lower than 600℃.The retention time of pellets in preheating zone should be about 5 minutes for improving thermal efficiency;in order to reduce the temperature of gas entering preheating zone,the retention time of pellets in decomposition and precalcination zone should be about 7 minutes.The approaches for reducing probability of the pellets agglomeration occurrence include: adopting pellet wrapped,increasing the gas velocity in the fluidized bed under high temperature,optimizing the system configuration.The experiment under high temperature was carried out after improving the experimental facilities.The fluidization of pellets of in the bed was successfully initiated by following steps:●Heating the bed body for 2 hours at about 1000℃;●Feeding pellets followed by increasing gas velocity,then repeating the operation step by step until pellets in the bed was enough.The mass flow rates to each of the sections in the whole height of the device were determined by mass balance.From the experimental results,the optimum operation parameters were recommended for future experiment under high temperature.

Related Dissertations

  1. Study on the Heat Transfer Characteristics of Particle Cluster in Circulating Fluidized Bed,TK124
  2. Study on the Combustion Character of Black Liquor from NSSC in Fluidized Bed,TK16
  3. Study of Effect of High Temperature Seperator on Hydrodynamices in CFB Boiler Furance,TK229.66
  4. Study on Fluidization and Drying of the Group C Particles in a CFB System,TQ028.67
  5. Coenzyme Q10 Prodction by Sphingomonas sp.ZUTE03 in a Two-phase Conversion System,TQ925
  6. Numerical Simulation about Flow Field Inside Desulfurization Tower in the Process of Semidry Flue Gas Desulfurization,X701.3
  7. Synthesis of Carbon Nanotubes/ Titanium Dioxide Composite Photocatalyst by Fluidized Bed Chemical Vapor Deposition (FBCVD) and Its Photocatalytic Properties,TB383.1
  8. Research and Application on DCS of Circulating Fluidized Bed Boiler,TP273
  9. The Synthesis of Zeolites with Circulating Fluidized Bed(CFB) Fly Ash and the Treatment of Fluoride Wastewater,X703
  10. Studies on Famotidine Sustained-Release Floating Pellets,R944
  11. Study on Metronidazole Sustained-Release Pellets,R944
  12. Studies on Famciclovir Sustained Release Pellets,R94
  13. Studies on Sustained-Release Pellets of Doxofylline,R94
  14. Fly Ash Unburned Ceramsite Preparation and Its Application Effect Study on Trionyx Sinensis Aquaculture Water Treatment,S966.5
  15. Numerical Simulation on Flow Field Characteristic of Air Distributor Equipment in the Circulating Fluidized Bed Boiler,TK229.66
  16. Analysis of Coal Combustion Desulfurization Efficiency for Circulating Fluided Bed Boiler,TK229.66
  17. Study on Movement and Absorption Characteristic of Three-Phase Fluidized Bed with Multiple Orifice Balls,X701.3
  18. Effects of Organic Types on the Characteristics of Pellets in a Self-pelleting Fluidized Bed Reactor,X703
  19. Research CFB Boiler Water Temperature Control System Base on Fuzzy Control,TK223.7
  20. Polyethylene fluidized bed electrostatic field control and experimental study,TQ325.12
  21. Research for 300MW Circulating Fluidized Bed Boiler Firing Gangue,TK229.66

CLC: > Industrial Technology > Chemical Industry > Silicate > Cement Industry > Production process and equipment
© 2012 www.DissertationTopic.Net  Mobile